Denominations are usually separated by how they are governed, not doctrine.
If all 41,000 are right, then that would mean that what we *feel* is right, not what God says. Obviously, the “doctrine isn’t important, just preach Christ” folks are wrong. When you preach biblical doctrine you *are* preaching Christ. Doctrine is another word for teaching. What men believe and practice is based on what they are taught. Jesus was the Master Teacher. Two doctrines that are in contradiction, let alone 41,000, can’t be right. What Christ said in the Bible is what’s right, what determines right doctrine, not preachers, conventions, councils, the State, or anything or anyone else. Doctrine is important: Mark 7:7, 2 John 9-11, 1 Tim. 4: 16
Just the ones the deny Jesus was the Christ come in the Flesh! That is the central test for ultimate orthodoxy found in 1John4. Quibbles and quarrels will occur but deny that God came as flesh and that group is of Anti-Christ!